Westward Expansion By hannah.robinson Jul 1, 1821 Mexico wins independence from Spain Oct 26, 1825 The Erie Canal is opened May 26, 1830 The Indian Removal Act is passed Jan 1, 1832 Worcester v. Georgia Nov 1, 1835 The Texas Rebellion begins Dec 29, 1835 Treaty of New Echota is signed Mar 6, 1836 The Alamo is taken by Mexican troops Jan 1, 1844 John Tyler's Treaty proposing the Annexation of Texas is defeated in the Senate Feb 1, 1845 Congress passes a measure to Annex Texas Jul 4, 1845 Texas convention votes to accept annexation Dec 29, 1845 Texas is admitted to the Union May 9, 1846 Polk receives word that Mexican forces have ambushed two American companies Nov 1, 1846 The Donner Party is snowbound Jan 1, 1848 Gold is discovered in California Feb 2, 1848 The Treaty of Guadalupe Hidalgo is signed Sep 9, 1850 California is admitted to the Union May 10, 1869 The first transcontinental railroad is completed Jun 1, 1876 The Battle of Little Bighorn Feb 8, 1887 The Dawes Severalty Act is passed Dec 29, 1887 The Massacre at Wounded Knee Feb 14, 1912 Arizona is admitted to the Union